On Sun, 16 Dec 2012 17:51:41 +0000, Chris Wilson chris@chris-wilson.co.uk wrote:
Avoid clobbering adjacent blocks if they happen to expire earlier and amalgamate together to form the requested hole.
In passing this fixes a regression from commit ea7b1dd44867e9cd6bac67e7c9fc3f128b5b255c Author: Daniel Vetter daniel.vetter@ffwll.ch Date: Fri Feb 18 17:59:12 2011 +0100
drm: mm: track free areas implicitlywhich swaps the end address for size (with a potential overflow) and effectively causes the eviction code to clobber almost all earlier buffers above the evictee.
Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Daniel Vetter daniel.vetter@ffwll.ch
On IRC I mentioned that I feared there be dragon lurking here. They turned out to be figments of my own code - a later patch to adjust the allocation of nodes was incomplete.
Please review and consider this patch. -Chris